Importing obj files from a list variable python
Thats an "accident" of early 1980’s. The first version of MS DOS used the forward slash for command-line options. When Microsoft added support for folders in MS-DOS 2.0, the forward slash was already taken so they used a backslash instead. Still stuck with this incompatibility 39 years later. 

Windows: C:\folder\file.txt

Most other OS: /folder/file.txt

But \ is an escape character in most OS, thats why you have to escape it and to escape it you use another \ so it becomes \\.

Using the variable os.path.sep will give you the correct one, so you can simply use it to build your paths. But if you know which os you are working on you can write it by hand, your choice.